RV-8564 Datasheet, PDF (22/40 Pages) MICORO CRYSTAL SWITZERLAND – I2C-Bus Interface Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8564
9.5.1.FIRST INCREMENT OF TIME CIRCUITS AFTER STOP BIT RELEASE
Bit
STOP
Prescaler bits¹⁾
F0F1-F2 to F14
1 Hz Tick
Time
hh:mm:ss
Comment
Clock is running normally
0
01-0 0001 1101 0100
12:45:12
Prescaler counting normally
STOP bit is activated by user. F0 and F1 are not reset and values cannot be predicted externally
1
XX-0 0000 0000 0000
12:45:12
Prescaler is reset; time circuits are frozen
New time is set by user
1
XX-0 0000 0000 0000
08:00:00
Prescaler is reset; time circuits are frozen
STOP bit is released by user
0
XX-0 0000 0000 0000
08:00:00
Prescaler is now running
XX-1 0000 0000 0000
08:00:00
-
XX-0 1000 0000 0000
08:00:00
-
XX-1 1000 0000 0000
08:00:00
-
:
:
:
11-1 1111 1111 1110
08:00:00
-
00-0 0000 0000 0001
10-0 0000 0000 0001
08:00:01
08:00:01
0 to 1 transition of F14 increments the time circuits
-
:
:
:
11-1 1111 1111 1111
08:00:01
-
00-0 0000 0000 0000
08:00:01
-
10-0 0000 0000 0000
08:00:01
-
:
:
-
11-1 1111 1111 1110
08:00:01
-
00-0 0000 0000 0001
08:00:02
0 to 1 transition of F14 increments the time circuits
1) _{F0 is clocked at 32.768 kHz.}
The first increment of the time circuits is between 0.507813 s and 0.507935 s after STOP bit is released. The
uncertainty is caused by the prescaler bits F₀ and F₁ not being reset and the unknown state of the 32.768 kHz
clock.
9.6. RESET
The RV-8564 includes an internal reset circuit which is active whenever the oscillator is stopped. In the reset state,
the I²C bus logic is initialized including the address pointer and all registers are set according to 8.7. I²C bus
communication is not possible during reset.
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